diff --git a/ponydos.asm b/ponydos.asm
index d401f85..953be04 100644
--- a/ponydos.asm
+++ b/ponydos.asm
@@ -153,12 +153,11 @@ draw_rect:
 
 	; Convert widths to bytes
 	shl bx, 1
-	shl cx, 1
 
 	.loop:
 		; Copy a row
 		pusha
-		rep movsb
+		rep movsw
 		popa
 
 		; Move to the next row in the input buffer